Severe dispute with team every now and then before the end of season (7)
I believe the answer is:
spartan
'severe' is the definition.
(I've seen this before)
'dispute with team every now and then before the end of season' is the wordplay.
'dispute' becomes 'spar' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'every now and then' indicates alternate letters (letters selected at regular intervals).
'before' means one lot of letters go next to another.
'the end of' says to take the final letters.
The last letter of 'season' is 'n'.
The alternating letters of 'team' are 'ta'.
'spar'+'ta'+'n'='SPARTAN'
(Other definitions for spartan that I've seen before include "Indifferent to comfort" , "Old citizen" , "Austere - disciplined" , "Strictly disciplined" , "Of conditions, simple and harsh as for ancient Greeks" .)